Industrial hammer with replaceable heads



y 1963 A. F. BIANCHINI 3,088,506

INDUSTRIAL HAMMER WITH REPLACEABLE HEADS Filed Aug. 9, 1960 FIG. 2

INVENTOR. ANDREW F. BIANCH IN BY Z:

ATTOR N E! I iw 12 -83-5 y United States My present invention relates to industrial hammers and more particularly to a so-called dead blow hammer having replaceable heads.

The principal object of the present invention vide a dead blow hammer which will retain its shape and characteristics over long periods of time.

Another object of the present'invention is to provide a dead blow hammer in which the head or heads are renewable and replaceable.

A further object of the present invention is to provide a dead blow hammer having a unique construction which is long wearing and will outlast conventional hammers used for this purpose.

Another obejct of the present invention is to provide a dead blow hammer which is easy and economical to manufacture and assemble and in which the replaceable head is simple and easy to install and lock in place.

With the above and other objects and advantageous features in view my invention consists of a novel arrangement of parts more fully disclosed in the detailed description following in conjunction with the accompanying drawings and more particularly defined in the appended claims.

iln the drawings,

FIG. 1 is a perspective view of a hammer embodying my invention.

FIG. 2 is an enlarged longitudinal section of the hammer head.

FIG. 3 is an enlarged exploded view showing the mounting of the removable-head.

For a great many'years-industrial hammers have been made of lead. The lead hammer is used by machinists and toolmakers where a weighted blow is required which will not bounce or recoil and which will not injure the work. It was found that lead is a soft metal which would produce the desired results. However, lead hammers have become a nuisance in most plants. The lead would flow and spread out, chip off and crack. Frequently the hammer head would have to be melted down and recast. The recent advances in the plastics art have made it possible to provide hammers with plastic heads which will deliver a blow without injuring the work but with less Wear and tear on the plastic head than on the lead hammer. The present invention provides a weighted hammer utilizing a plastic head which will deliver a dead blow with the proper weighted force. Furthermore, the plastic heads of the hammer of the present invention are replaceable easily and quickly thus eliminating the recasting nuisance.

Referring more in detail to the drawings, FIG. 1 illustrates a hammer made in accordance with the present invention. It is provided with a metal T-shaped head having plastic heads 11 and a suitable handle 12. Now referring to FIG. 2, the T-shaped portion 10 may be cast from any suitable material such as steel, bronze, malleable iron or aluminum and comprises a hollow cylindrical portion 13 having end walls 14 at each end defining an elongated chamber in the portion 13. The end walls 14 are positioned slightly inwardly from the ends of the portion 13 with the inner walls of the outer portion tapering slightly outwardly at 15. Intermediate the ends of the portion 13 is the hammer holding portion 16 in the form of an oval socket.

The head 10 may of course be of any desirable size. To provide the necessary weight without resiliency so as to deaden the blow, the hollow portion 13 between the is to pro- 3,9885% :Patented May 7, 1963 19 and having a closed end wall 21-. The member 18 is internally threaded. The portion 20 is then slotted at 22" with a comparatively wide slot which removes part of the circumference. The end 21 is then pinched together as shown in FIG. 3 to form atapered socket having internal threads. Each member 18 is then mounted at op posite ends of the T-shaped head 10 by screwing the portion 19 into the opening in the walls 14 with the portions 20 extending towards each other into the chamber portion 13. Prior to assembly the members 18 may be tempered to provide a stiff resiliency to the portion 20;

The plastic heads 11 are molded to an elongated threaded bolt 23 which is provided with an enlarged crossed head 24 having integral depending fins or lugs 25. The

head 24 and lugs 25 may be fixed to the bolt 23 in any desired manner or may be threaded thereon. The tough plastic head 11' is molded to the head 2450 that the head' is completely surrounded by the plastic material as shown in FIG. 2, the lugs 25 preventing rotating movement between the bolt and the plastic head. Also, the head 241 is imbedded in the plastic material adjacent the inner end" thereof so as to avoid stiffening the plastic and allowing a thick cushion area as shown in FIG. 2. The inner end of the plastic head is provided with a narrowed tapered portion 26 which nests within the extended portions 15 of the T-shaped member 10.

Assembly of the hammer may now be described as fol-j lows: The handle 12. is forced into the collar portion 16 of the T-shaped member 10. To anchor the handle in place I propose to use an epoxy resin glue which has an extremely strong bond. The glue may be positioned along the surface of the hammer handle at 27, and in addition the inner end of the portion 16 may be grooved at 28'so that a ring of additional glue encircles the handle 12. Now one end of the hammer head'is co'r'npletelyassembled. This is done by threading the member 18 into the opening in one of the wall portions 14. The member can be anchored in place by applying the same epoxy resin to the threads 19 and the member 18 is threaded in until the outer end of the portion 19 is flush with the outer surface of the wall 14. One of the hammer heads 11 is now placed in position by threading the bolt 23 into the member 18. It will pass easily through the portion 19 and then enter the tapered portion 20. From this point on further movement of the bolt 23 will tend to spread the two halves of the portion 20 into the position shown in FIG. 2. Since this portion is tempered it will have a spring action and will clamp on the bolt 23 to lock it in place. If desired some of the epoxy resin may be placed on the threads. If the head is being replaced, it will take considerable force to unscrew it. However, the tempered portion 20 will resume the position shown in FIG. 3 and be ready to clamp the replacement bolt. The enclosed end 21 prevents the shot 17 from spilling out when the head 11 is not in place.

The shot 17 is now poured through the opening in the other wall 14 and the assembly is repeated at the other end to complete the hammer as shown in FIG. 2. The resultant hammer is thus provided with the required weight, it will deliver a dead blow without bouncing, its plastic heads will protect the work and are readily replacable when worn out, and the entire hammer is strong ly and firmly assembled with a minimum of parts.

Other advantages of the present invention will be readily apparent to a person skilled in the art.

I claim:

1. A dead blow hammer comprising a cylindrical housing having an integral depending socket portion inter-. mediate its ends for receiving a handle, said housing having an integral wall portion spaced from each end forming a central chamber, a quantity of loose shot in said chamber, each end portion extending beyond said wall portion to form an annular recess, a molded plastic hammer head replaceably mounted in each recess, said head mounting including a central threaded opening in each wall portion and a lock member extending into said chamber and threadedly engaging said opening, said head having an axially extended portion entering said lock member, and a hammer handle anchored in said depending socket portion.

2. A dead blow hammer comprising a cylindrical housing having an integral depending socket portion intermediate its ends for receiving a handle, said housing having an integral wall portion spaced from each end forming a central chamber, each end portion extending beyond said wall portion to form an annular recess, a molded plastic hammer head replaceably mounted in each recess, said head mounting including a central threaded opening in each wall portion and a lock member extending into said chamber and threadedly engaging said opening, said lock member comprising an internally threaded cylindrical member, the inner portion of said member having a longitudinal slot, the portions of said member at said slot being forced towards each other to taper said member inwardly, said head having an axially extended portion entering said lock member, and a hammer handle anchored in said depending socket portion.

3. A dead blow hammer comprising a cylindrical housing having an integral depending socket portion intermediate its ends for receiving a handle, said housing having an integral wall portion spaced from each end forming a central chamber, a quantity of loose shot in said chamber, each end portion extending beyond said wall portion to form an annular recess, a molded plastic hammer head replaceably mounted in each recess, said head mounting including a central threaded opening in each wall portion and a lock member extending into said chamber and threadedly engaging said opening, said lock member comprising an internally threaded cylindrical member, the inner portion of said member having a longitudinal slot, the portions of said member at said slot being forced towards each other to taper said member inwardly, said head having an axially extended portion entering said lock member, and a hammer handle anchored in said depending socket portion.

4. A dead blow hammer comprising a cylindrical housing having an integral depending socket portion intermediate its ends for receiving a handle, said housing having an integral wall portion spaced from each end forming a central chamber, each end portion extending beyond said wall portion to form an annular recess, a molded plastic hammer head replaceably mounted in each recess, said head mounting including a. central threaded opening in each wall portion and a lock member extcnding into said chamber and threadedly engaging said opening, said hammer head having a threaded shank extending from the rear thereof, said shank entering said lock member, and a hammer handle anchored in said depending socket portion.

5. A dead blow hammer comprising a cylindrical housing having an integral depending socket portion intermediate its ends for receiving a handle, said housing having an integral Wall portion spaced from each end forming a central chamber, each end portion extending beyond said wall portion to form an annular recess, a molded plastic hammer head replaceably mounted in each ecess, said head mounting including a central threaded opening in each wall portion and a lock member extending into said chamber and threadedly engaging said opening, said lock member comprising an internally threaded cylindrical member, the inner portion of said member having a longitudinal slot, the portions of said member at said slot being forced towards each other to taper said member inwardly, said hammer head having a threaded shank extending from the rear thereof, said shank entering said cylindrical member, the tapered portion of said cylindrical member frictionally grasping said shank, and a hammer handle anchored in said depending socket portion.

References Cited in the file of this patent UNITED STATES PATENTS 2,455,885 Theurer Dec. 7, 1948 2,601,294 Jahn et a1 June 24, 1952 2,604,914 Kahlen July 29, 1952 2,678,853 Reeder May 18, 1954 2,823,574 Rosan Feb. 18, 1958 2,989,101 Carmien June 20, 1961 

1. A DEAD BLOW HAMMER COMPRISING A CYLINDRICAL HOUSING HAVING AN INTEGRAL DEPENDING SOCKET PORTION INTERMEDIATE ITS ENDS FOR RECEIVING A HANDLE, SAID HOUSING HAVING AN INTEGRAL WALL PORTION SPACED FROM EACH END FORMING A CENTRAL CHAMBER, A QUANTITY OF LOOSE SHOT IN SAID CHAMBER, EACH END PORTION EXTENDING BEYOND SAID WALL PORTION TO FORM AN ANNULAR RECESS, A MOLDED PLASTIC HAMMER HEAD REPLACEABLY MOUNTED IN EACH RECESS, SAID HEAD MOUNTING INCLUDING A CENTRAL THREADED OPENING IN EACH WALL PORTION AND A LOCK MEMBER EXTENDING INTO SAID CHAMBER AND THREADEDLY ENGAGING SAID OPENING, SAID HEAD 